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(Article of periodic en Anglais - 1985)

Document title

Porphyritic pyroxene-bearing granitoids - a strongly weathered rock group in central Finland

Authors(s) and Affiliation(s)

LAHTI S. I. ;

Abstract

Preglacial weathering. Two stages have been recognized in the weathering process. The first stage is characterized by granular disintegration followed by the subsequent alteration of biotite into vermiculite, and leaching of K, Na and Mg. During the second weathering stage plagioclase is altered into kaolinite, and the breakdown of dark minerals promotes leaching of Ca, Na, Fe and Mg. The residue has been slightly enriched in K-feldspar, quartz and clay minerals. Si and Al have not dissolved during weathering, due to pH-Eh conditions

Source

Article of periodic

published at : Fennia / ISSN 0015-0010

Editor : Societas Geographica Fenniae, Helsinki - FINLANDE (1889- 2009)

Millesime : 1985, vol. 163, no2 [pp. 315-321]

Bibliographic references : 15 réf.

Language

Anglais

Localisation

Geological survey of Finland - Espoo

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